Alterações na distribuição 3.22.18

Fixes a fatal problem in 3.22.17 on Linux; after shutdown not all threads died properly.

• Added option -O flush_time=# to mysqld. This is mostly useful on Windows and tells how often MariaDB should close all unused tables and flush all updated tables to disk.
• Fixed problem that a VARCHAR column compared with CHAR column didn't use keys efficiently.

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